serializer.DumpJson: Control indentation by parameter
serializer.DumpJson: Control indentation by parameter

If the simplejson module supports indentation, it's always used. There
are cases where we might not want to use it or enable it only for
debugging purposes, such as in RPC.

Reviewed-by: iustinp


leshchevds/ganeti,andir/ganeti,mbakke/ganeti,ganeti/ganeti,andir/ganeti,yiannist/ganeti,mbakke/ganeti,grnet/snf-ganeti,onponomarev/ganeti,apyrgio/snf-ganeti,ganeti/ganeti,grnet/snf-ganeti,andir/ganeti,apyrgio/ganeti,dimara/ganeti,mbakke/ganeti,bitemyapp/ganeti,bitemyapp/ganeti,ganeti-github-testing/ganeti-test-1,apyrgio/snf-ganeti,dimara/ganeti,ganeti/ganeti,onponomarev/ganeti,yiannist/ganeti,yiannist/ganeti,ganeti-github-testing/ganeti-test-1,apyrgio/ganeti,leshchevds/ganeti,leshchevds/ganeti